Devices for checking a leakage of steam from a steam trap. In some embodiments, the device may comprise a body having an inlet end portion connected to the steam trap and an outlet end portion. The device may allow condensate water of the steam trap to flow in through the inlet end portion so as to be discharged through the outlet end portion. The device may further comprise a truncated pyramid part formed to protrude from the middle of the body so as to communicate with the inside of the body; a first steam-water separating means for separating re-evaporated steam re-evaporated from the condensate water flowing through the body; a second steam-water separating means for separating the re-evaporated steam separated from the water in the first steam-water separating means; and a temperature measuring means for measuring and transmitting the temperature of an upper inside of the truncated pyramid part.
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